My truck won't idle right

TREYSTEWART

1997 FORD EXPLORER

180,000 MILES

My truck won't idle right. I have cleaning the MAF sensor and the idle air control valve. I have a code scanner and the codes read PO171 system lean bank 1, and PO174 system lean bank 2. I was told this was my intake gaskets. I just replaced my intake gaskets and it still reads the same codes